The goat’s heat cycle is influenced by daylight hours. This reproductive pattern is called?

• A. Monoestrous
• B. Polyestrous
• C. Anestrous
• D. Seasonally Polyestrous

Answer: (D)

Photoperiod, or the length of day, can control when an animal cycles sexually. In goats this daylight signal tunes the reproductive axis so multiple heat cycles occur during a specific part of the year, rather than all year round. That pattern—having several estrous cycles confined to a breeding season driven by day length—is described as seasonally polyestrous. So goats can have repeated heats during the season when daylight cues promote cycling, followed by a period of no cycling outside that season.

This fits best because the other terms describe different patterns: a monoestrous animal has one heat per year, a polyestrous animal has multiple heats year-round, and an anestrous animal has little to no estrous activity.